WO2014157522A1 - Corrosion prevention sheet, and corrosion prevention sheet manufacturing method - Google Patents

Abstract

Provided is a corrosion prevention sheet manufacturing method in which a corrosion prevention sheet is manufactured by causing a base material sheet to support an oil paste containing oil and wax, said method being characterised by the wax being crystalline, and by comprising a step for forcibly cooling the oil paste supported by the base material sheet from a temperature exceeding the crystallisation temperature of the wax, to a temperature lower than said crystallisation temperature.

Description

Anticorrosion sheet and method for producing anticorrosion sheet Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2013-067529 and Japanese Patent Application No. 2014-052259, and is incorporated herein by reference.

The present invention relates to an anticorrosion sheet and a method for producing the anticorrosion sheet.

Conventionally, in various plants, a tape-shaped anticorrosion sheet (anticorrosion tape) is provided on the outer periphery of the pipe material in order to protect metal pipe materials such as gas and water pipes and electric pipes for laying electric wires from corrosion. By winding, the anticorrosive tape can be used as a coating layer, and the corrosion of the tube material to be adhered can be suppressed.
As an anticorrosion tape used for this kind of use, what was made to impregnate and carry the oily paste containing oil and wax to the base material sheet which consists of a nonwoven fabric etc. is known (refer the following patent documents 1).

Japanese Unexamined Patent Publication No. 06-184968

However, this anticorrosion tape has a problem that the oil may be separated from the oily paste, and if the oil is separated from the oily paste, a uniform coating layer cannot be formed when the anticorrosion tape is wound around the adherend. is there.
In addition, when the anticorrosion tape is wound and stored in a roll shape, when the oil is separated from the oily paste, the oil adheres to the anticorrosion tape on the back side, and then hardens in the attached state, so-called blocking. May occur. As a result, this anticorrosion tape has a problem that the oil and wax are also taken on the back surface of the anticorrosion tape, and as a result, a uniform coating layer cannot be formed when the anticorrosion tape is wound around the adherend.

In view of the above problems, an object of the present invention is to provide a method for producing an anticorrosion sheet capable of producing an anticorrosion sheet in which oil is difficult to separate from an oily paste, and an anticorrosion sheet produced by this production method.

The present invention relates to a method for producing an anticorrosion sheet by producing an anticorrosion sheet by supporting an oily paste containing oil and wax on a base material sheet, wherein the wax is a crystalline wax, and the base material sheet There is provided a method for producing an anticorrosion sheet, comprising forcibly cooling the oil-based paste carried on a wax from a temperature exceeding the crystallization temperature of the wax to a temperature lower than the crystallization temperature.

Moreover, as one aspect of the method for producing the anticorrosion sheet according to the present invention, the cooling is performed by spraying a gas having a temperature lower than the crystallization temperature onto the oily paste.

Moreover, this invention exists in the anti-corrosion sheet | seat manufactured by the manufacturing method of the said anti-corrosion sheet | seat.

The equipment block diagram which showed typically the manufacturing equipment of a corrosion prevention sheet.

Hereinafter, a method for producing an anticorrosion tape will be described as an example of a preferred embodiment of the method for producing an anticorrosion sheet according to the present invention.

In the manufacturing method of the anticorrosion tape of this embodiment, an anticorrosion tape is manufactured by making an oil-based paste carry | support on a tape-shaped base material sheet.
Hereinafter, first, the oil-based paste and the base sheet for constituting the anticorrosion tape will be described.

The oily paste contains, as oil components, oil that is liquid oil that is liquid at normal temperature and pressure (for example, 20 ° C. and 1 atmosphere) and wax that is solid oil at normal temperature and pressure.
In the present specification, the term “solid” does not mean only a solid in a strict sense that does not cause a deformation by a normal external force, but a natural material that does not cause a deformation by an external force. It is used to include so-called semi-solids that do not cause flow.

The oily paste of the present embodiment contains the oily component, that is, the oil and the wax.
Furthermore, the oil-based paste of this embodiment contains additives such as a tackifier.

The oil component is preferably contained in the oil paste in a proportion of 50% by mass to 70% by mass, and more preferably 55% by mass to 65% by mass.

Examples of the wax include fatty acid ester waxes such as fatty acid amide waxes such as ethylene bis stearamide, hydrocarbon waxes, and the like.
Examples of the oil include naphthenic oil, high viscosity oil such as bright stock oil, and low viscosity paraffinic oil used as motor oil.
Among these, the oil-based paste preferably contains a hydrocarbon wax and a naphthenic oil in that the oil can be prevented from separating from the oil-based paste.

The wax is a crystalline wax.
In the present specification, the term “crystalline wax” refers to a crystallization peak measured in a constant temperature heating process at 10 ° C./min using a differential scanning calorimeter (DSC). This means a wax that exhibits a crystallization peak of 10 J / g or more. The crystallization peaks are about 104 J / g for paraffin wax (melting point 43 ° C.), about 122 J / g for polyethylene wax (melting point 108 ° C.), and about 20 to 385 J / g for ester wax.

The hydrocarbon wax is preferably contained so that the proportion of the oily component is 50% by mass or more and 85% by mass or less, and may be contained so that the proportion is 60% by mass or more and 75% by mass or less. More preferred.
As the hydrocarbon wax, for example, paraffin wax defined in JIS K2235 by types such as 120P, 125P, 130P, 135P, 140P, 145P, 150P, and 155P, and 150M, 160M, and 170M in the same standard. , 180M, 190M, etc., can be used.
Non-standard hydrocarbon waxes can also be used, for example, synthesized by reacting carbon monoxide, called Fischer-Tropsch wax, with hydrogen. It is also possible to employ those obtained by polymerization of ethylene or polyethylene thermal decomposition called polyethylene wax, or synthetic wax called polypropylene wax.
Furthermore, the oil-based paste may contain a hydrocarbon wax by a wax mainly composed of a hydrocarbon wax such as candelilla wax or slack wax.

Among these, in order to prevent the oil from separating from the oil-based paste, it is preferable that the oil-based paste contains a hydrocarbon wax having a melting point equal to or higher than a temperature assumed in actual use of the anticorrosion tape.
On the other hand, hydrocarbon waxes generally show a tendency to increase in hardness as the melting point becomes higher. Therefore, when trying to adopt one having an excessively high melting point, suitable spreadability at room temperature for oil-based pastes In order to exhibit this, a lot of liquid oil is contained, and the oil may be separated from the oily paste.
For this reason, it is preferable to employ a hydrocarbon wax having a melting point of 75 ° C. or higher and 100 ° C. or lower.
The melting point of the hydrocarbon wax can be confirmed by the test method described in JIS K2235 “Petroleum wax”.

The hydrocarbon wax having a melting point of 75 ° C. or more and 90 ° C. or less is preferably 50% by mass or more and 100% by mass or less in all hydrocarbon waxes contained in the oil paste, and is 75% by mass or more. More preferably, the content is 100% by mass or less, and particularly preferably 85% by mass or more and 100% by mass or less.
The hydrocarbon wax having a melting point of 75 ° C. or more and 90 ° C. or less is preferably contained at a ratio of 0.75 times or more with respect to the total mass of all the liquid oils contained in the oily paste.

That is, the wax may be a wax that exhibits crystallinity as a whole even if it contains a plurality of waxes. That is, the wax may include an amorphous wax alone. Examples of other waxes include microwax, petrolatum, lanolin, and amorphous polypropylene (such as atactic polypropylene).

The naphthenic oil is not particularly limited as long as it contains a saturated ring structure such as cyclopentane or cyclohexane in the molecule, and commercially available products can be used.

The naphthenic oil is preferably contained in the oily paste so that the proportion of the naphthenic oil in the oily component is 15% by mass or more and 50% by mass or less, and is 25% by mass or more and 40% by mass or less. More preferably, it is contained in an oily paste.

The tackifier is an important component for imparting moderate surface tackiness to the oil-based paste and causing the anticorrosion tape to exhibit excellent adhesion to an object to be protected such as piping.
Examples of the tackifier include natural rubber and synthetic rubber. Examples of the synthetic rubber include room temperature liquid polybutene, which is a low polymer of isobutylene, and room temperature solid polyisobutylene obtained by highly polymerizing isobutylene. Is mentioned.
Moreover, tackifiers, such as an alicyclic saturated hydrocarbon resin, can also be contained in the oil-based paste of this embodiment.
About these tackifiers, each of them can change the effect of imparting tackiness to oily pastes depending on temperature conditions, etc. It is preferable to use a plurality in combination rather than including in the paste.
That is, the oil paste preferably contains a plurality of polybutene, polyisobutylene, and alicyclic saturated hydrocarbon resin, and it is preferable that all of these three types of tackifiers are contained in the oil paste.
The tackifier is preferably contained in the oil paste so that the total amount is 4 to 7 parts by mass with respect to 100 parts by mass of the oil component.

In addition to the tackifier, the oily paste includes, for example, inorganic fillers such as calcium carbonate, clay, talc, silica, alumina; rust preventives, fungicides, antibacterial agents, weathering agents, brighteners, etc. Functional agents; pigments and the like can be added as additives.

The base sheet for supporting such an oily paste is not particularly limited, but it is preferable to adopt a fiber sheet in consideration of the supportability of the oily paste, for example, a thickness of 0.8 mm or more 3 A fiber sheet having a basis weight of 60 g / m ² or more and 280 g / m ² or less can be employed.

More specifically, polyester resins such as polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate resin, and polylactic acid resin; polyamide resins such as aliphatic polyamide resin and aromatic polyamide resin; polyolefins such as polyethylene resin and polypropylene resin Resin: Textile sheets such as non-woven fabrics and woven fabrics made of fibers made of engineering plastics such as polyimide resin, polyamideimide resin, polyethersulfone resin, polyetheretherketone resin, polyphenylene sulfide resin, and polyketone resin It can illustrate as a preferable base material sheet of the form of anticorrosion tape.

The base sheet includes semi-synthetic fibers such as acetate fibers; regenerated fibers such as rayon; natural fibers such as cotton, hemp, wool, and silk; inorganic fibers such as carbon fibers, glass fibers, rock wool, and metal fibers. Nonwoven fabrics and woven fabrics made of can also be used.

When a non-woven fabric is employed as the base sheet, any one of the above-described fibers may be used alone or a mixture of a plurality of fibers may be used.

In addition, when a woven fabric is used as the base sheet, one or more of the above fibers are arranged or twisted cords are plain weave, mat weave, twill weave, or satin weave Can be adopted.

Among such fiber sheets, the base sheet of the anticorrosion tape of the present embodiment is preferably a nonwoven fabric made of polyester fibers from the viewpoint of excellent performance for impregnating and carrying the oil-based paste.
As the polyester fiber non-woven fabric, those produced by various methods such as spun bond, chemical bond, needle punch, stitch bond and the like can be adopted, and among them, a non-woven fabric formed by stitch bonding is preferable.

The anticorrosion tape of this embodiment can suppress separation of oil from the oil-based paste by employing a fiber sheet such as a stitch bond nonwoven fabric as a base sheet.
In addition, since the stitch bond nonwoven fabric has larger surface irregularities than felt or the like, when the stitch bond nonwoven fabric is employed as a base sheet of the anticorrosion tape, a part of the base sheet is applied to the surface of the anticorrosion tape. There is a risk of exposure.
On the other hand, the anticorrosion tape of this embodiment is preferably formed so that the surface of the base sheet is not exposed on both the front and back surfaces of the anticorrosion tape in order to exhibit high anticorrosion performance.

About the manufacturing method of the anti-corrosion tape by which the base material sheet was suppressed from being exposed to the surface while using the said polyester fiber nonwoven fabric (henceforth a "polyester nonwoven fabric") formed by the stitch bond for a base material sheet. This will be described below.
The anticorrosion tape manufacturing method of this embodiment produces a long strip | belt-shaped anticorrosion sheet | seat, and slit-processes this to the appropriate width | variety and makes it an anticorrosion tape.
First, an apparatus configuration suitable for manufacturing the anticorrosion sheet will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram illustrating a production facility for producing the anticorrosion tape of the present embodiment. As shown in the figure, the production method uses a base sheet roll 1 in which a long strip of polyester nonwoven fabric is rolled.
In addition, the manufacturing equipment for manufacturing the anticorrosion tape of the present embodiment includes a paste tank 2 that heats the oily paste as shown in the drawing to store the oily paste in a low-viscosity liquid state. Is provided.
Furthermore, in the manufacturing equipment of the present embodiment, the base sheet roll 1 is rotatably held, and the base sheet roll 1 is rotated and the polyester nonwoven fabric 10 fed from the outside thereof is transferred to the paste tank 2. A delivery device 3 for sending out is provided.

The manufacturing facility of the present embodiment is arranged on the opposite side of the sending machine 3 with the paste tank 2 interposed therebetween, and the polyester nonwoven fabric 10 sent from the sending machine 3 is impregnated with the oily paste in the paste tank 2. A winder 4 is further provided which takes up the anticorrosion sheet 11 obtained in this manner and winds it in a roll.

Further, the manufacturing facility of the present embodiment includes a pair of heating rolls 51, and sandwiches the polyester nonwoven fabric 10 sent from the feeder 3 before the paste tank 2 between the pair of heating rolls 51, and the polyester A hot set machine 5 for compressing the nonwoven fabric 10 in the thickness direction is provided.
In addition, the manufacturing facility of the present embodiment is excessively attached from a polyester nonwoven fabric 10 ′ (hereinafter also referred to as “impregnated sheet 10 ′”) that has passed through the paste tank 2 and is impregnated and supported by the oily paste. A thickness controller 6 is provided for scraping off the oil-based paste being formed to form the anticorrosion sheet 11 having a predetermined thickness.

And in the manufacturing equipment of this embodiment, the cooler 7 for forcibly cooling the anticorrosion sheet 11 that has passed through the thickness controller 6 and has a predetermined thickness includes the thickness controller 6 and the winder 4. It is prepared between.

In the manufacturing equipment for producing the anticorrosive sheet of this embodiment, the polyester non-woven fabric 10 fed out from the feeder 3 on which the base sheet roll 1 is mounted becomes the anticorrosive sheet 11 and is wound by the winder 4. The polyester nonwoven fabric 10 and the anticorrosion sheet 11 are configured to travel at a substantially constant speed.

That is, the manufacturing facility of the present embodiment is a heated and melted oil-based paste in which the polyester nonwoven fabric 10 that has been fed from the feeder 3 and continuously compressed by the hot set machine 5 is stored in the paste tank 2. The polyester nonwoven fabric 10 is configured to be impregnated with an oil-based paste while passing through. In addition, the manufacturing facility of the present embodiment is configured such that the impregnated sheet 10 ′ that has passed through the paste tank 2 is adjusted to the supporting amount of the oily paste by the thickness controller 6 to become the anticorrosion sheet 11. ing. Furthermore, the manufacturing equipment of this embodiment is configured such that the anticorrosion sheet 11 is cooled by the cooler 7 and wound by the winder 4.

As the delivery device 3, for example, it is possible to adopt a configuration that can send out the polyester nonwoven fabric 10 at a constant speed while applying an appropriate brake.

The hot set machine 5 is configured to compress the polyester nonwoven fabric 10 delivered from the delivery machine 3. The hot setting machine 5 is provided in the manufacturing facility of the present embodiment in order to suppress the fuzz of the stitch bond nonwoven fabric and introduce it into the paste tank 2.
That is, the hot set machine 5 is provided in the anticorrosion sheet manufacturing facility so as to exert a function of ironing the polyester nonwoven fabric 10 with the heating roll 51.
Therefore, as the hot set machine 5, it is preferable that the heating roll 51 has a sufficient heating capability and has a smooth surface.

In order to impregnate and carry the oily paste on the polyester nonwoven fabric 10 compressed by the hot set machine 5, the oily paste is heated to a temperature equal to or higher than the melting point of the wax contained in the oily paste. It is preferable to sufficiently reduce the viscosity.
Therefore, it is preferable to employ a paste tank 2 having a heating capability capable of sufficiently reducing the viscosity of the oil-based paste.

Note that the temperature of the oil-based paste in the paste tank 2 need not be higher than the melting point of all the waxes contained in the oil-based paste, and may be higher than the melting point of the hydrocarbon wax.
For example, in the case of an oily paste mainly composed of a hydrocarbon wax having a melting point of about 80 ° C., a wax having a melting point of about 145 ° C., such as ethylenebisstearic acid amide, is heated to a temperature of about 100 ° C. to 140 ° C. Even if it contains, since the oil-based paste can be sufficiently reduced in viscosity, the paste tank 2 does not need to have an excessive heating capability.

As the paste tank 2, for example, a winding roll 21 for winding the polyester nonwoven fabric 10 is arranged on the tank bottom, and the polyester nonwoven fabric 10 supplied from the hot set machine 5 is wound around the winding roll 21. What was comprised so that it could send out toward the said thickness control machine 6 after being immersed in the oil-based paste of a heat-melting state is employable.

As the thickness controller 6, an apparatus provided with a member for passing through the paste tank 2 and impregnating the oily paste and contacting the loaded impregnated sheet 10 ′ to scrape off the excess oily paste is adopted. can do. For example, as the thickness controller 6, the first thickness regulating member 61 for scraping off the oil-based paste that is brought into contact with one surface of the impregnated sheet 10 ′ and excessively adhered to the surface of the one surface. And a second thickness regulating member for scraping off the oil-based paste that is brought into contact with the impregnated sheet 10 'from the other side opposite to the one side and is excessively adhered to the surface on the other side One having 62 can be employed.

In addition, as the 1st thickness control member 61 or the 2nd thickness control member 62, the plate-shaped thing and roll-shaped thing whose length is longer than the width | variety of the said polyester nonwoven fabric 10 pulled up from the said paste tank 2 are used. Can be adopted.
As the thickness regulating members 61 and 62, the oil-based paste on the surface of the impregnated sheet has a smoother and uniform thickness when a member having a curved surface is brought into contact with the impregnated sheet 10 ′ than with an angular member. Therefore, it is preferable to adopt a roll shape.

In the present embodiment, the stitch bond nonwoven fabric used as the base sheet is usually observed as one knitted yarn being two on one side 10a and one on the other side 10b. It is formed so that. The stitch bond nonwoven fabric is in a tight state with fewer voids on the side where two stitches are observed compared to the side where only one stitch is observed.

That is, the polyester nonwoven fabric 10 according to the present embodiment is less likely to be impregnated with the oily paste on the one side 10a on the side of the second stitch than on the other side 10b on the side of the first stitch. However, it is difficult for oily paste to be supported on the surface.

From this, the thickness controller 6 is configured so that the first thickness regulating member 61 and the second thickness regulating member 62 are simultaneously brought into contact with the impregnated sheet 10 ′ so that the one surface side 10a ′ and the other surface side. A difference in the amount of the oil-based paste carried on the surface is likely to occur with 10b ′.
Therefore, with respect to the thickness controller 6, the timing at which the amount of oil paste carried on the polyester nonwoven fabric 10 is regulated by the first thickness regulating member 61 on the one surface side 10a, and the second thickness regulation on the other surface side 10b. It is preferable to set separately the timing at which the amount of the oil-based paste carried by the member 62 is regulated. In addition, with respect to the thickness controller 6, it is preferable that the thickness regulating members 61 and 62 be offset with respect to the traveling direction of the impregnated sheet 10 ′.

That is, as the thickness controller 6 of this embodiment, a roll having a length longer than the width of the polyester nonwoven fabric 10 is employed as the first thickness regulating member 61 and the second thickness regulating member 62, A roll that is the thickness regulating member 61 (hereinafter, also referred to as “first roll 61”) and a roll that is the second thickness regulating member 62 (hereinafter, also referred to as “second roll 62”) are offset. preferable.

In the following, with respect to a preferred embodiment of the thickness controller 6, the impregnated sheet 10 ′ is pulled up vertically from the paste tank 2, and the thickness controller 6 is disposed above the paste tank 2 as an example. Will be described in more detail.

In the thickness controller 6, the first roll 61 brought into contact with one surface side 10 a ′ of the impregnated sheet 10 ′ and the second roll 62 brought into contact with the other surface side 10 b ′ of the impregnated sheet 10 ′. Is arranged such that the axial direction is substantially horizontal and the axial directions are substantially parallel to each other.
As described above, the first roll 61 is arranged higher than the second roll 62.
Accordingly, the first roll 61 is disposed so as to be parallel to the second roll 62 obliquely on the upper side.
Moreover, as shown in the figure, the first roll 61 and the second roll 62 are not only arranged offset (displaced) in the vertical direction, but also their side edges are perpendicular to the vertical line. They are arranged differently.
In other words, the second roll 62 on the lower side in the vertical direction has a perpendicular line passing through the side edge on the first roll side (the phantom line C in FIG. 1) on the second roll side of the first roll 61 on the upper side. It is distribute | arranged so that it may pass between a side edge and a central axis.
Similarly, in the first roll 61, a perpendicular (imaginary line D in FIG. 1) passing through the side edge on the second roll side passes between the side edge on the second roll side of the first roll 61 and the central axis. Is arranged.

Accordingly, after the impregnated sheet 10 ′ pulled up from the paste tank 2 is bent slightly so that the second roll 62 is brought into contact with the other surface side 10b ′ and the one surface side 10a ′ is on the outside. The first roll 61 is brought into contact with the one surface side 10a 'and passes through the thickness controller 6 in a slightly bent shape so that the other surface side 10b' is on the outside, contrary to the previous case. become.

Further, the first roll 61 and the second roll 62 are arranged in the thickness controller 6 with a gap larger than the thickness of the anticorrosion sheet to be produced.

The first roll 61 is provided in the thickness controller 6 so as to rotate so that the outer peripheral surface in contact with the impregnated sheet 10 ′ moves in a direction opposite to the moving direction of the impregnated sheet 10 ′. .
In this embodiment, the first roll 61 has substantially the same length, and the distance can be adjusted while making the distance from the outer peripheral surface of the first roll 61 substantially constant in the axial direction. The thickness controller 6 is further provided with an adjusting member 63 arranged in the above manner.

The first roll 61 has a function of scraping off excess oily paste adhering to the one side 10a 'of the impregnated sheet 10'. Further, the first roll 61 is more likely to be exposed because the one side 10a of the polyester nonwoven fabric 10 on the side of the second stitch is tightly tightened, and the yarn is more easily exposed. It is rotated so as not to be exposed, and is used in combination with the adjusting material 63.

In the polyester nonwoven fabric 10, the tension on the impregnated sheet 10 ′ is changed because the one side 10a is tightly tightened, and a stronger tension is generated on the impregnated sheet 10 ′ than before. At this time, the oily paste is easily scraped off.
For this purpose, the first roll 61 adjusts the thickness of the oil-based paste on the entire outer peripheral surface to a predetermined thickness by passing the excess oil-based paste carried on the outer peripheral surface between the adjusting material 63 by rotation. The thickness-adjusted oil-based paste is again attached to the surface of the impregnated sheet 10 ', and thus the thickness control is performed to more reliably prevent the yarn from being exposed to the surface of the anticorrosion tape. It is provided in the machine 6.

On the other hand, since the other surface side 10b of the polyester nonwoven fabric 10 is relatively flexible, it is difficult to cause a change in the amount of oily paste carried due to a change in tension.
Therefore, the second roll 62 may be configured to be provided with a regulating member and rotated in the same manner as the first roll 61, but may be provided in the thickness controller 6 so as to be stationary.

The first roll 61 and the second roll 62 cool the oily paste carried on the impregnated sheet 10 ′ below the crystallization temperature of the wax as the main component by contact with the impregnated sheet 10 ′. If so, the viscosity of the oil-based paste suddenly increases and the oil-based paste may peel off from the polyester nonwoven fabric 10, so that the surface temperature exceeds the crystallization temperature and passes through the thickness controller 6. It is preferable to have a heating function to maintain the oily paste at a temperature exceeding the crystallization temperature.

As the first roll 61 and the second roll 62, a metal roll having a diameter of 100 mm to 350 mm and having a flow path for an electric heater or a heat medium can be adopted.

And the said cooling machine 7 for forcibly cooling the anti-corrosion sheet which passed this thickness control machine 6 sprays the gas of temperature lower than the crystallization temperature of the wax of the said oil-based paste on the oil-based paste of the said anti-corrosion sheet It can be comprised by what was comprised, the cooling roller etc. which are contact | abutted to the said anti-corrosion sheet | seat and are rotated with a movement of an anti-corrosion sheet | seat.

It is preferable that the cooler 7 is configured to blow a gas having a temperature lower than the crystallization temperature of the wax of the oil paste onto the oil paste of the anticorrosion sheet. By having such a configuration, the cooler 7 can cool a relatively wide range of the surface of the anticorrosion sheet.
As the gas, it is preferable to use a gas containing moisture. By using a gas containing moisture, the oil-based paste of the anticorrosion sheet can be efficiently cooled by the latent heat of vaporization of water.
Further, as the gas containing moisture, it is more preferable to use a gas (for example, mist) containing fine water particles. When moisture-containing gas is sprayed onto the anti-corrosion sheet, water particles may collide with the uncured oil-based paste, resulting in dents on the surface of the anti-corrosion tape. However, the smaller the water particle size, the smaller the size of the dents. It is because it can be made.
The water particles preferably have a particle size of 50 μm or less, more preferably 1 to 20 μm.

Further, the winder 4 is not particularly limited, and a winder configured to take up the anticorrosion sheet at a constant speed and wind it in a roll shape can be adopted.

Subsequently, the manufacturing method which manufactures an anticorrosion tape using such a manufacturing facility is demonstrated.
First, the base sheet roll 1 is set in the delivery machine 2, the belt-like polyester nonwoven fabric 10 is fed out from the outside of the base sheet roll 1, and is fed out between the pair of heating rolls 51 provided in the hot setting machine 5. After passing the polyester nonwoven fabric 10 passed, the polyester nonwoven fabric 10 is wound around a winding roll 21 of the paste tank 2, and the tip of the polyester nonwoven fabric 10 is passed through the thickness controller 6 to the winder 4. Carry out the paper passing work.
At this time, in the thickness controller 6, the outer peripheral surface of the first roll 61 is brought into contact with the one surface side 10 a of the polyester nonwoven fabric 10 over the entire width, and the first roll is formed over the entire width with the other surface side 10 b of the polyester nonwoven fabric 10. Appropriate tension is generated in the polyester nonwoven fabric 10 so that the outer peripheral surface of 62 is brought into contact with each other and the contact pressure between the rolls 61 and 62 and the polyester nonwoven fabric 10 is adjusted.

Thereafter, the oil-based paste heated and melted is stored in the paste tank 2 and kept at a predetermined temperature, and the heating roll 51 of the hot set machine 5, the first roll 61 and the second roll 62 of the thickness controller 6 are set to a predetermined temperature. set.
Then, after determining the distance between the first roll 61 and the adjusting material 63 and the rotational speed of the first roll 61, the operation of the manufacturing facility is started.

In this manufacturing method, the polyester nonwoven fabric 10 compressed by the heating roll 51 of the hot set machine 5 is introduced into the paste tank 2, so that the fuzz of the polyester nonwoven fabric 10 is suppressed and the heat melting stored in the paste tank 2 is retained. The thickness of the polyester nonwoven fabric 10 once compressed in the oily paste in a state is restored to some extent, and the impregnation property of the oily paste into the polyester nonwoven fabric is improved.

Thereafter, the impregnated sheet 10 ′ taken out from the paste tank 2 is introduced into the thickness controller 6, and the oily paste adhering excessively to the one side 10 a ′ and the other side 10 b ′ is rolled into the rolls 61, 62. The anticorrosion sheet adjusted to a predetermined thickness is formed by scraping off using the outer peripheral surface of.
In the thickness controller 6, the first roll 61 and the second roll 62 are arranged in a state offset as above and below. With respect to the anticorrosion sheet, first, after the amount of the oily paste loaded on the other surface side 10b ′ of the impregnated sheet 10 ′ is adjusted by the second roll 62, the one surface side 10a ′ opposite to the other surface side 10b ′. The carrying amount of the oily paste is adjusted by the first roll 61 and the adjusting material 63.

Conventional thickness control machines are generally configured using two long blades. In addition, the conventional thickness controller is arranged so that the blades face each other and the distance between the blades is the finished thickness of the anticorrosion sheet, and the impregnated sheet is passed through the blade. Has been.
Therefore, the anticorrosion sheet obtained by passing through a conventional thickness controller is uniform in thickness and excellent in surface smoothness.
On the other hand, when the conventional anticorrosion sheet adopts a substrate sheet with relatively large surface irregularities such as a stitch bond nonwoven fabric, the amount of oil paste carried on the surface becomes locally thin, Depending on the case, the surface of the base sheet may be exposed.

In contrast, in this embodiment, the outer peripheral surfaces of the rolls 61 and 62 are used for scraping off the oil-based paste, instead of using a member having a sharp edge such as a blade.
While the blades are in substantially line contact with the impregnated sheet, the rolls 61 and 62 can ensure a wide contact width with the impregnated sheet 10 ′. A high contact pressure can be prevented from acting locally in the meantime.
Moreover, in the present embodiment, while the impregnated sheet 10 ′ is in contact with the first roll 61 or the second roll 62, another member is not brought into contact with the opposite surface.
Therefore, the impregnated sheet 10 ′ can be easily moved away from the rolls 61 and 62 while being in contact with the rolls 61 and 62, and the possibility that the oily paste is scraped off excessively can be suppressed.
Moreover, in this embodiment, the oil paste carried on the outer peripheral surface of the first roll 61 with a predetermined thickness by adjusting the gap between the adjusting material 63 and the first roll 61 is impregnated away from the first roll 61. Since it is transferred to the one side 10a ′ of the finished sheet 10 ′, the density (fiber density) is higher on the one side than the other side as in the case of a stitch-bonded nonwoven fabric, and it is in a tightly tightened state. However, the surface exposure of the base sheet can be more reliably suppressed by passing the thickness controller 6 so that the tightly tightened side becomes the second roll 62 side.

Note that the amount of the oil-based paste carried on each surface of the anticorrosion sheet is determined by the tension of the impregnated sheet 10 ′ in the thickness controller (the pressing force to the first roll 61 and the second roll 62), the first roll 61 and the first roll. The temperature can be adjusted by the temperature and rotation speed of the two rolls 62.

After passing through the thickness controller 6, the anticorrosion sheet is forcibly cooled by the cooler 7 and wound by the winder 4. In the cooling by the cooler 7, the base sheet is used. The oily paste carried on the substrate is forcibly cooled from a temperature exceeding the crystallization temperature of the wax to a temperature lower than the crystallization temperature.
The crystallization temperature means a peak temperature of a crystallization peak measured in a constant speed heating process at 10 ° C./min using a differential scanning calorimeter (DSC).
More specifically, the forced cooling of the anticorrosion sheet by the cooler 7 is performed so that the temperature of the oil-based paste reaches a cooling rate of 2 ° C./second or more before and after the crystallization temperature of the wax on the surface of the anticorrosion sheet. The cooling rate is preferably 5 ° C./second or more, and more preferably 10 ° C./second or more.
More preferably, the inside of the anticorrosion sheet is carried out so as to achieve the above cooling rate. That is, it is preferable that the inside of the anticorrosion sheet is implemented so that the temperature of the oily paste becomes a cooling rate of 2 ° C./second or more before and after the crystallization temperature of the wax, and the cooling rate is 5 ° C./second or more. More preferably, it is more preferably 10 ° C./second or more.
When multiple types of wax are included in the oil paste and multiple crystallization occurs at different temperatures, the effect can be achieved by forced cooling at any crystallization temperature, but the temperature with the largest amount of crystallization heat. It is preferable to perform forced cooling in the region.

Thus, the wax in the oil-based paste after cooling is forced by performing cooling from the temperature at which the oil-based paste exceeds the crystallization temperature of the wax to a temperature lower than the crystallization temperature. It can be microcrystallized.
That is, since the wax exhibits the property of taking in liquid oil between the crystal regions, the trapping ability can be improved by microcrystallization of the wax as described above.

In addition, after cooling as described above, the anticorrosion sheet may be wound as it is with the winder 4, or may be wound with a separate film interposed therebetween.
The wound anticorrosion sheet can be used as an anticorrosion tape after being slit as it is or with an appropriate width.

Moreover, the anticorrosion tape which is an anticorrosion sheet concerning this embodiment is manufactured by the manufacturing method of the anticorrosion tape concerning this embodiment. The anticorrosion tape according to the present embodiment is obtained by supporting an oily paste on a base sheet.

From the above, the method for producing an anticorrosion sheet according to the present embodiment is a method for producing an anticorrosion sheet by carrying an oily paste containing oil and wax on a base sheet, wherein the wax is A step of forcibly cooling the oil-based paste, which is a crystalline wax, supported on the base sheet from a temperature exceeding the crystallization temperature of the wax to a temperature lower than the crystallization temperature;
According to such a method for producing an anticorrosion sheet, the oily paste carried on the base sheet is forcibly cooled from a temperature exceeding the crystallization temperature of the wax to a temperature lower than the crystallization temperature. The wax can be microcrystallized.
That is, since the wax exhibits the property of taking oil between the crystal regions, the oil trapping ability can be improved by microcrystallization of the wax as described above.
Therefore, according to such a method for producing an anticorrosion sheet, it is possible to produce an anticorrosion sheet in which oil is difficult to separate from the oily paste.

Moreover, according to the manufacturing method of the anticorrosion sheet which concerns on this embodiment, the said cooling is performed by spraying the gas of temperature lower than the said crystallization temperature on the said oil-based paste.
According to such a method for producing an anticorrosion sheet, cooling is performed by forcibly cooling the oily paste from a temperature exceeding the crystallization temperature of the wax to a temperature lower than the crystallization temperature. The wax in the later oily paste can be microcrystallized. This makes it easier for the wax to capture the oil that is a liquid oil.

Further, the anticorrosion sheet according to this embodiment is manufactured by the method for manufacturing an anticorrosion sheet according to this embodiment.

Note that the anticorrosion sheet of the present invention and the method for producing the anticorrosion sheet of the present invention are not limited to the configuration of the above embodiment. Moreover, the anticorrosion sheet of this invention and the manufacturing method of the anticorrosion sheet of this invention are not limited to an above-described effect. The anticorrosion sheet of the present invention and the method for producing the anticorrosion sheet of the present invention can be variously modified without departing from the gist of the present invention.

1: base sheet roll, 10: polyester nonwoven fabric, 11: anticorrosion sheet

Claims (3)

1. An anti-corrosion sheet manufacturing method for manufacturing an anti-corrosion sheet by supporting an oily paste containing oil and wax on a base sheet,
   The wax is a crystalline wax;
   A method for producing an anticorrosion sheet comprising forcibly cooling the oily paste carried on the base sheet from a temperature exceeding the crystallization temperature of the wax to a temperature lower than the crystallization temperature. .
2. The method for producing an anticorrosion sheet according to claim 1, wherein the cooling is performed by spraying a gas having a temperature lower than the crystallization temperature onto the oily paste.
3. An anticorrosion sheet produced by the method for producing an anticorrosion sheet according to claim 1 or 2.

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